java - 如何从 android spinner 获取文本？

Question

我正在创建一个 Android 微调器。它显示正确，但选择选项时没有任何反应。为什么“if”命令不起作用？

public class Main2Activity extends AppCompatActivity {
Spinner spinner;
ArrayAdapter<CharSequence> adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);
    spinner= (Spinner) findViewById(R.id.spinner);
    adapter=ArrayAdapter.createFromResource(this,R.array.spinner,android.R.layout.simple_spinner_item);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinner.setAdapter(adapter);
    spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {//why 'if' command is not working?
            if(adapterView.getItemAtPosition(i).toString().equals("Question 1"))
            {
                Intent intent=new Intent(Main2Activity.this,Main2Activity.class);
            }
            if(adapterView.getItemAtPosition(i).toString().equals("Question 2"))
            {
                Intent intent=new Intent(Main2Activity.this,main3Activity.class);
            }

        }

        @Override
        public void onNothingSelected(AdapterView<?> adapterView) {

        }
    });`

Answer 1

您没有有意开始 Activity 。这样做:

        startActivity(intent);

在 if 和 else 中进行 Intent 声明和赋值之后。